accretion

Accretion may refer to:

• Accretion (astrophysics), the formation of planets and other bodies by collection of material through gravity
• Accretion (atmosphere), the process by which water vapor in clouds forms water droplets around nucleation sites
• Accretion (coastal management), the process where coastal sediments return to the visible portion of the beach following storm erosion
• Accretion (geology), the increase in size of a tectonic plate by addition of material along a convergent boundary

• Accretionary wedge

• Accretion (meteorology), the process by which a larger hydro-meteor grows by collecting smaller ones lying in its path as it falls through a cloud.

L’accrétion est en astrophysique, en géologie, en médecine et en météorologie la constitution et l'accroissement d'un corps, d'une structure ou d'un objet par apport et/ou agglomération de matière, généralement en surface ou en périphérie de celui-ci.